On Thu, Nov 15, 2018 at 4:07 AM Igor Cicimov <ig...@encompasscorporation.com> wrote:
> > > On Thu, Nov 15, 2018 at 1:36 AM Aleksandar Lazic <al-hapr...@none.at> > wrote: > >> Hi Vijay. >> >> Am 14.11.2018 um 10:14 schrieb Vijay Bais: >> > Hello Aleksandar, >> > >> > We already considered using haproxy maps but we still have to define N >> backends >> > for corresponding N keys in the map file. >> > I'm looking more at an implementation with single backend definition >> with the >> > server options as placeholders. >> > >> > Ex. Using maps would look something like this >> > >> > frontend nat >> > bind *:10000 >> > use_backend %[req.hdr(X-MyHeader), map(/etc/haproxy/my.map)] >> > >> > backend example1.com >> > server myserver1 example1.com:80 source 10.0.0.1 >> > >> > backend example2.com >> > server myserver2 example2.com:80 source 10.0.0.2 >> > >> > backend example3.com >> > server myserver3 example3.com:80 source 10.0.0.3 >> > >> > >> > >> > Whereas, we are looking for something like below >> > >> > >> > frontend nat >> > bind *:10000 >> > default_backend generic >> > >> > backend generic >> > server myserver %[req.hdr(X-MyHeader)] source %[dst] >> >> Ah now concrete examples ;-) >> >> Maybe you can use the server template?! >> >> https://cbonte.github.io/haproxy-dconv/1.8/configuration.html#4-server-template >> >> So you would like to have something like this, is this possible, I don't >> think so? >> >> backend generic >> server-template myserver 1-3 %[req.hdr(X-MyHeader)]:80 check source >> 0.0.0.0 >> usesrc %[dst] >> > @Aleksandar Lazic <al-hapr...@none.at> tried using server-template, but it won't work > >> Which version of HAProxy do you use? >> > We are using v1.8.13 >> haproxy -vv >> > HA-Proxy version 1.8.13 2018/07/30 Copyright 2000-2018 Willy Tarreau <wi...@haproxy.org> Build options : TARGET = linux2628 CPU = generic CC = gcc CFLAGS = -O2 -g -fno-strict-aliasing -Wdeclaration-after-statement -fwrapv -fno-strict-overflow -Wno-unused-label OPTIONS = USE_LINUX_TPROXY=1 USE_ZLIB=1 USE_REGPARM=1 USE_OPENSSL=1 USE_LUA=1 USE_PCRE=1 Default settings : maxconn = 2000, bufsize = 16384, maxrewrite = 1024, maxpollevents = 200 Built with network namespace support. Built with zlib version : 1.2.3 Running on zlib version : 1.2.8 Compression algorithms supported : identity("identity"), deflate("deflate"), raw-deflate("deflate"), gzip("gzip") Built with PCRE version : 7.8 2008-09-05 Running on PCRE version : 8.21 2011-12-12 PCRE library supports JIT : no (USE_PCRE_JIT not set) Built with multi-threading support. Encrypted password support via crypt(3): yes Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT IP_FREEBIND Built with Lua version : Lua 5.3.4 Built with OpenSSL version : OpenSSL 1.0.1e-fips 11 Feb 2013 Running on OpenSSL version : OpenSSL 1.0.1e-fips 11 Feb 2013 OpenSSL library supports TLS extensions : yes OpenSSL library supports SNI : yes OpenSSL library supports : SSLv3 TLSv1.0 TLSv1.1 TLSv1.2 Available polling systems : epoll : pref=300, test result OK poll : pref=200, test result OK select : pref=150, test result OK Total: 3 (3 usable), will use epoll. Available filters : [TRACE] trace [COMP] compression [SPOE] spoe >> > Thanks, >> > Vijay >> >> Regards >> Aleks >> >> > On Wed, Nov 14, 2018 at 1:39 PM Aleksandar Lazic <al-hapr...@none.at >> > <mailto:al-hapr...@none.at>> wrote: >> > >> > Hi. >> > >> > Am 14.11.2018 um 08:46 schrieb Vijay Bais: >> > > Hello, >> > > >> > > We have a requirement wherein a single generic backend with >> server options >> > > configured as placeholders, which will resolve on the fly or at >> runtime. >> > > >> > > Currently, we have to define multiple backends (has to be >> hardcoded) and >> > select >> > > them using the /use_backend/ keyword. >> > > >> > > Kindly help us with this generic backend implementation in >> HAProxy and let us >> > > know if its possible OR any alternative way that this can be >> achieved. >> > >> > Maybe you can use maps for your requirement. >> > >> > https://www.haproxy.com/blog/introduction-to-haproxy-maps/ >> > >> > As an example can you take a look at the openshift router template >> ;-) >> > >> > >> https://github.com/openshift/origin/blob/master/images/router/haproxy/conf/haproxy-config.template#L201-L202 >> > >> > > Thank you in advance, >> > > Vijay B >> > >> > Regards >> > Aleks >> > > You will need something dynamic like described here > https://www.haproxy.com/blog/haproxy-and-consul-with-dns-for-service-discovery/ > Thanks Igor! Let me explore this and get back :)
